Spidi Thorax Warrior is a thoracic protector in accordance with prEN1621-3 directives, able to offer a wider protecting surface while increasing the thermal insulation of motorcyclist. We found out that: A 3-layer jacket, equipped with the Chest Protector increases its thermal insulation by 11.5% A 3-layer jacket equipped with the Thorax Protector increases its thermal insulation by 15% Thorax Protector can be equipped to all SPIDI jackets that that can be equipped with traditional WarriorChest protector; alternatively can be worn using the straps provided.